feat: surgery pipeline API, video inference, voice confirm, and tests

- Add FastAPI routes for surgery start/end, results, pending confirmation (WAV upload), and health checks.
- Implement RTSP/Hikvision capture, consumable classification, session manager, MinIO/Baidu voice resolution, and DB persistence.
- Add documentation (client API, video backends, staging checklist) and sample camera/RTSP config.
- Add pytest suite (API contract, session manager, voice, repositories, pipeline persistence) and httpx dev dependency.
- Replace deprecated HTTP_422_UNPROCESSABLE_ENTITY with HTTP_422_UNPROCESSABLE_CONTENT.
- Fix SurgeryPipeline DB reads to use an explicit transaction with autobegin disabled.

Made-with: Cursor

Dockerfile

@@ -1,5 +1,14 @@
 FROM python:3.13-slim-bookworm
 
+# OpenCV (pulled in by ultralytics) links against X11 client libs; slim images omit them.
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    ffmpeg \
+    libgl1 \
+    libglib2.0-0 \
+    libgomp1 \
+    libxcb1 \
+    && rm -rf /var/lib/apt/lists/*
+
 COPY --from=ghcr.io/astral-sh/uv:latest /uv /usr/local/bin/uv
 
 WORKDIR /app